HNF 461 1st Edition Lecture 12 Outline of Last Lecture I Functions of the GI Tract II Layers of the GI Tract III Oral Cavity IV Swallowing V Stomach a Cell Types VI Small Intestine VII Movement of Food through the Intestines VIII Large Intestine Colon IX Tight Junctions X GI Disorders a GERD b Crohn s Disease c Celiac s Disease d Pancreatitis Outline of Current Lecture I Classification of Carbohydrates a Simple b Complex II Structure of Starch a Amylose b Amylopectin III Digestion in the Mouth IV Digestion in the Stomach V Digestion in the Small Intestine These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute a In the villi VI Enzymes VII Common Disaccharides Current Lecture CHO Structure and Digestive Enzymes 1 Classification of Carbohydrates a Simple i Monosaccharides 1 sugar unit ii Disaccharides 2 sugar units b Complex i Oligosaccharides 3 10 sugar units ii Polysaccharides 10 sugar units 1 Starch and Fiber 2 Structure of Starch a Amylose i Linear chain of glucose molecules bonded by alpha 1 4 glycosidic bonds b Amylopectin i Similar to the structure of amylose except that it has branching points ii Contains alpha 1 4 glycosidic and alpha 1 6 glycosidic bonds occur at the branching points iii Similar structure to glycogen but glycogen has more branching points 3 Digestion in the Mouth a Begins with the enzyme found in saliva called salivary amylase b Amylose Digestion Amylase cleaves bonds forming dextrins c Amylopectin Amylase cleaves alpha 1 4 glycosidic bonds only forming dextrins 4 Digestion in the Stomach a No digestion of carbohydrates occur in the stomach 5 Digestion in the Small Intestine a Pancreatic duct releases pancreatic juice contains pancreatic amylase b Amylose Amylase digests dextrins into maltose disaccharide c Amylopectin Amylase digests dextrins into maltose and limit dextrins d In the villi i Amylose Maltose is hydrolyzed by maltase which forms glucose ii Amylopectin Maltose is hydrolyzed by maltase which forms glucose Limit dextrins are hydrolyzed by alpha dextrinase also called isomaltase which forms glucose 6 Enzymes a Maltase digests maltose b Isomaltase digests limit dextrins c Sucrose digests sucrose d Lactase digests lactose 7 Common Disaccharides a Maltose intermediate product of starch digestion composed of two glucose units b Lactose composed of 1 glucose unit and 1 galactose unit is only found in milk lactose intolerant if have a lactase deficiency c Sucrose most common disaccharide composed of 1 glucose unit and 1 fructose unit
View Full Document
Unlocking...